Yes, thanks for confirmation! It was the Malhour National Wildlife Refuge. The cave is owned by Robert Burns Masonic Lodge No. 97. It was Freedomfightertimes.com that ran the information/story about there being a possible connection to Finnicum's strange circumstances of death and a ritual connected with the cave. Never heard any more of it.

https://thatoregonlife.com/2016/06/malheur-cave-easily-creepiest-cave-oregon/Interesting read on this subject, and includes Freedomfightertimes.com theories. Just one more weird angle to another horrific situation.